Yes, a larger cage is good with more to do inside. normally enrichment means bringing out natural behaviors, like different type of prey, or making the animals work for food. That's done by hiding food and or placing in in many different areas of the cage.
With varanids, they always became bored with any cage you gave them. So from time to time, I simply put them in a different cage. This almost always induced reproduction. Monitor are no different then other species except they are expressive. They simply do not put up with sweater box set ups and such, they simply fall over dead.
One easy trick is placing something new in the cage like a log and keep changing it out every week or so.
This is why I feed live, it without question simulates hunting and killing behavior, which is WHAT THEY DO. So, what can you guys come up with. Oh wait, one more, I keep reptiles in groups, even kingsnakes and the reason is simple, it gives them something to do while I am away and I am away most of the time. Again its what they do. Not that I am all that, its just that I have visited this question for decades. What can we do for the captives. Best wishes and keep up the good work. That you are talking about this is excellent.

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